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Review the program block containing G31 and identify all G-codes and M-codes on the same line or in the same modal group.

Remove or relocate incompatible commands such as M06, G04, G10, G52, G53, coordinate system changes (G54-G59), or canned cycles (G73-G89) to blocks before or after the G31 skip function.

Ensure only linear interpolation (G01) or G31 itself is programmed during the skip operation with appropriate feed rate and axis movements.

Test the modified program in single block mode to verify the G31 skip cycle executes without alarm and properly responds to the skip signal input.

Ensure probe or skip signal is properly connected before testing to prevent unexpected machine movement.

Verify that only one G31 command is active per block and check that the P-address (P1-P4 for multi-skip) matches available skip inputs on your system.

Check parameter 6200-6207 (skip signal input settings) to confirm the skip signal number referenced in G31 P_ is properly configured and enabled.

Ensure proper program structure: separate preparatory functions, call G31 with explicit axis destinations and feed rate (example: G31 Z-50. F500), and avoid stacking multiple modal groups.

Review ladder diagram or PMC signal status to confirm skip input signal (SKIP1-4) is correctly wired and functioning before program execution.

Incorrect skip signal wiring may cause unintended machine movement or workpiece collision.

Examine the G31 block and surrounding lines for macro variable operations (#1=#2), conditional expressions (IF/WHILE), or subprogram calls (M98).

Move all macro variable assignments and calculations to program blocks before the G31 skip command, ensuring variables are pre-calculated before the skip motion begins.

If using subprograms for probing routines, ensure G31 is called within the subprogram itself, not in the same block as the M98 call from the main program.

After restructuring, verify skip position is correctly stored in system variables (5061-5065 for X-C axes) and can be retrieved for subsequent calculations or offsets.